CPC B29B 11/14 (2013.01) [B29C 2949/078 (2022.05); B29C 2949/0725 (2022.05); B29C 2949/0856 (2022.05); B29K 2067/003 (2013.01); B29K 2105/253 (2013.01)] | 17 Claims |
1. A container preform (1) made of plastics material, comprising:
a cylindrical body (3) extending along an axis of revolution (A) of the preform;
a bottom (4) closing the cylindrical body (3),
the bottom (4) having an outer profile (41) that has a central portion (5) and a curved portion (6) joining the central portion (5) to the cylindrical body (3), the central portion (5) having, in longitudinal section, a first concave section (52), the curved portion (6) having in succession, in longitudinal section, from the first concave section (52) toward the cylindrical body (3), a first convex or frustoconical section (61), a second concave section (62) and a second convex or frustoconical section (63), wherein the second convex or frustoconical section (63) has in succession, in longitudinal section, from the cylindrical body (3) toward the second concave section (62), a first radius of curvature (631), a second radius of curvature (632) and a third radius of curvature (633) and wherein said preform has a plane of intersection (P) defined by the junction between the cylindrical body (3) and the bottom (4), the plane of intersection (P) being perpendicular to the axis of revolution (A) of the preform (1), wherein the value of the first radius of curvature (631) is between 60% and 100% of the value of a radius of the cylindrical body (3) measured on the plane of intersection (P), and wherein the value of the second radius of curvature (632) is less than or equal to the value of a diameter of the cylindrical body (3) measured on the plane of intersection (P).
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